Speaker
Description
Nuclear charge radii of silver isotopes have been extensively investigated using laser spectroscopy [1,2,3]. However, the dependence of this method on large-scale atomic calculations for mass and field shift determination introduces significant systematic uncertainties that dominate the uncertainty of the extracted radii. Deviations with nuclear density functional theory [1,3] further emphasize the necessity for precise investigation of the mass and field shift for silver. Experimental determination is planned to be performed by employing muonic x-ray spectroscopy on $^{107}$Ag, $^{109}$Ag and $^{108m}$Ag (longest-lived radio-isotope of Ag, half-life = 483 years).
The absolute charge radius of at least three silver isotopes is imperative for experimental determination of the mass and field shift.
While $^{107}$Ag and $^{109}$Ag can be readily enriched in large amounts, $^{108m}$Ag requires a more intricate approach and can only be produced in microscopic quantities.
Nonetheless, advancements in the muonic x-ray spectroscopy method have enabled the treatment of targets down to 5\,$\mu$g [4].
In this contribution, we report on the preliminary measurements performed at the Paul Scherrer Institute in October 2023.
Furthermore, we outline the progress made in producing the $^{108m}$Ag target, including insights from a proof-of-concepts experiment conducted at CERN-ISOLDE in November 2023.
[1] M. Reponen, R.P. de Groote, et al. Evidence of a sudden increase in the nuclear size of proton-rich silver-96. Nature
Communications, 12(1):4596, 2021.
[2] R. Ferrer et al. In-gas-cell laser ionization spectroscopy in the vicinity of 100Sn: Magnetic moments and mean-square
charge radii of N= 50–54 Ag. Physics Letters B, 728:191–197, 2014.
[3] R. de Groote. Collinear resonance ionization spectroscopy of silver between N = 50 and N = 82. Technical report, 2020.
proposal number: INTC-P-551, experiment number: IS660, http://cds.cern.ch/record/2752917?ln=en.
[4] A. Adamczak et al. Muonic atom spectroscopy with microgram target material. The European Physical Journal A, 59(2):15,
2023.
